jQuery

This entry doesn't need any comment. If somebody is writing a lot of javascript, try with jQuery.  This tool is  very powerful  because has selectors and useful predefined functions.

The official website is  http://www.jquery.com.

I recomended to take a look to UI website too,  http://jqueryui.com/.
I resolved to use jQuery because exists a widget called datepicker that solves many problems that I have with other similar javascript artifact to give support to IE 6.0.

When you feel comfortable, visit this 7 things I wish I had know about jQuery, and this Working with Events part 1, and if you want to check some blogs, look at this: 15 blogs to follow for jQuery lovers.



Others important links:
http://plugins.jquery.com/ site with a lot of jQuery's plugins.
http://jquerylist.com/ a list with plugins and useful widgets.
http://www.visualjquery.com/ very useful site to search jQuery functions references.
http://www.addedbytes.com/cheat-sheets/download/javascript-cheat-sheet-v1.png  An useful "cheat sheet" to whom knows javascript programming lenguage and just needs a memory help.